[Bug target/105033] Suboptimal for vec_concat lower halves of two vectors.

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105033

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>:

https://gcc.gnu.org/g:105c56a8cfde6015b989ab22c20c915c1b4e69ec

commit r13-518-g105c56a8cfde6015b989ab22c20c915c1b4e69ec
Author: liuhongt <hongtao....@intel.com>
Date:   Fri May 13 09:59:13 2022 +0800

    Optimize vpermtiw/b to vpunpcklqdq for certain cases.

    Assembly Optimization like:
    -       vmovq   %xmm0, %xmm2
    -       vmovdqa .LC0(%rip), %xmm0
            vmovq   %xmm1, %xmm1
    -       vpermi2w        %xmm1, %xmm2, %xmm0
    +       vmovq   %xmm0, %xmm0
    +       vpunpcklqdq     %xmm1, %xmm0, %xmm0

    ...

    -.LC0:
    -       .value  0
    -       .value  1
    -       .value  2
    -       .value  3
    -       .value  8
    -       .value  9
    -       .value  10
    -       .value  11

    gcc/ChangeLog:

            PR target/105033
            * config/i386/sse.md (*vec_concatv4si): Extend to ..
            (*vec_concat<mode>): .. V16QI and V8HImode.
            (*vec_concatv16qi_permt2): New pre_reload define_insn_and_split.
            (*vec_concatv8hi_permt2): Ditto.

    gcc/testsuite/ChangeLog:

            * gcc.target/i386/pr105033.c: New test.